Author Topic: 1986 RM250 rotor nut left hand thread?  (Read 3097 times)

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Offline LegOwt

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1986 RM250 rotor nut left hand thread?
« on: May 20, 2015, 11:44:50 am »
Manual doesn't say anything about the rotor nut on a 1986 RM250.

Anyone know for sure if its LH or RH thread?



Also I bought a rotor puller from ebay but it doesn't look like its going to fit - its a 27x1.0 Lh Ext. but was listed as correct for 86 RM250.

Appreciate comments on that too :)


Offline D project

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #1 on: May 20, 2015, 12:52:57 pm »
Should be anti clockwise thread. The puller you've probably bought is to suit the earlier style flywheels with three bolt holes so it's not gunna work.

Offline LegOwt

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #2 on: May 20, 2015, 03:48:51 pm »
Can't believe I cannot find a flywheel puller for this in Australia...its the 8 hole disc type probably universal with a lot of other early 2 strokes. Anyone have any info to help?

Offline pmc57

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #3 on: May 20, 2015, 10:27:45 pm »
Looks like it's R/H thread to me, you can just see the thread lead-in in the nut and on the end of the shaft. Most end-of-crank threads on the left side of motor are R/H thread, only the R/H side of crank like some of the primary drive nuts are L/H thread.

Offline Lozza

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #4 on: May 21, 2015, 07:48:16 am »
I think you would need a 'smacker' puller. A thick bit of plate with a 20mm nut welded to it and 16mm hole in the centre. Then 2 holes for bolts to go into the rotor M6?? tapped holes. A bit of bronze between the end of the crank and the 20mm bolt that will go into the nut. Then preload the bolt and then hit it with a copper hammer, preload again smack with hammer rinse repeat until it comes off.
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Offline LegOwt

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #5 on: May 21, 2015, 08:15:20 am »
Good info - thx Lozza

Offline GMC

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #6 on: May 23, 2015, 08:20:27 pm »
I think you would need a 'smacker' puller. A thick bit of plate with a 20mm nut welded to it and 16mm hole in the centre. Then 2 holes for bolts to go into the rotor M6?? tapped holes. A bit of bronze between the end of the crank and the 20mm bolt that will go into the nut. Then preload the bolt and then hit it with a copper hammer, preload again smack with hammer rinse repeat until it comes off.

That sounds really makeshift and dodgy ;D :D



Pretty sure I built this 3 bolt version in 86 for my 200, still use it today on other Kawasakis
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Offline DR500

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Re: 1986 RM250 rotor nut left hand thread?
« Reply #7 on: May 23, 2015, 08:25:12 pm »
rh thread . use a harmonic balancer puller with 8mm bolts